La-Mulanese Unlearnable??

I've translated 60% of La-Mulanese, but I beat all 8 guardians before translating the last tablet, and now the last translation tablet is blocked by a giant tentacle thing. So that's really great. is it possible to get the final translation, or have I perma-stucked myself?

Maybe? Try using the Lamp of Time before entering the room. There's a glitch where entering a room with that active prevents things which are sometimes solid (breakable walls, e.g.) from being solid until the lamp runs out.